function [ patch_data ] = my_bot()
    robot_width = 1;
    robot_height = 1; 
    rectangle = @(w, h) [w/2 h/2 1; -w/2 h/2 1; -w/2 -h/2 1; w/2 -h/2 1];
    shift = @(r, x, y) r + repmat([x, y, 0], size(r, 1), 1);
    body = rectangle(robot_width, robot_height);
    vertices = [body];
    colors = [128, 128, 250]/255; 
    faces =[1 2 3 4 1];
   patch_data = []; 
   patch_data.vertices = vertices;
   patch_data.colors = colors;
   patch_data.faces = faces;
end